Number of compositions (= ordered integer partitions) of n into 2n parts.

A165817

Number of compositions (= ordered integer partitions) of n into 2n parts.

Terms

    a(0) =1a(1) =2a(2) =10a(3) =56a(4) =330a(5) =2002a(6) =12376a(7) =77520a(8) =490314a(9) =3124550a(10) =20030010a(11) =129024480a(12) =834451800a(13) =5414950296a(14) =35240152720a(15) =229911617056

External references